Youssef Assioun, MD
NPI 1639370919 · Gastroenterology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Youssef Assioun, MD is a Gastroenterology Physician provider in Saint Louis, MO (NPI 1639370919).
Provider details
- NPI number
- 1639370919
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2010006463 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
448 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 74 | $84 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 68 | $236 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 47 | $45 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 47 | $166 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 41 | $123 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 227 | 211 |
| Omeprazole | 168 | 60 |
| Pantoprazole Sodium | 135 | 41 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 84 | 79 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 57 | 53 |
| Famotidine | 49 | 19 |
| Sod Sulf/Pot Chloride/Mag Sulf |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,776 across 56 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-31
- Last updated
- 2023-09-08
- Certified
- 2023-09-08
Frequently asked questions
- What is Youssef Assioun's NPI number?
- Youssef Assioun's National Provider Identifier (NPI) is 1639370919, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Youssef Assioun's specialty?
- Youssef Assioun is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Youssef Assioun located?
- Youssef Assioun's practice location on file with NPPES is 10012 Kennerly Rd Ste 102, Saint Louis, MO 63128-2197.
- What is Youssef Assioun's phone number?
- The practice phone number listed in the NPPES registry for Youssef Assioun is (314) 543-5911.
- Does Youssef Assioun accept Medicare?
- Youssef Assioun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Youssef Assioun's NPI active?
- Yes — Youssef Assioun's NPI (1639370919) is active in the NPPES registry as of the last update on 2023-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.